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Top Forums Shell Programming and Scripting Replace specific field on specific line sed or awk Post 302576828 by ahamed101 on Saturday 26th of November 2011 04:48:11 PM
Old 11-26-2011
Try this...
Code:
awk -F: '{if($0~bike&&new_mileage-$10>=4000){$10=new_mileage}}1' bike=Suzuki new_mileage=12000 OFS=":" input_file

or

Code:
#!/bin/bash

read -p "Which bike ? : " bike
read -p "Enter new mileage : " new_mileage
old_mileage=$( sed "/$bike/{s/.*:\([0-9]*\)$/\1/g}" input_file )
((diff=new_mileage-old_mileage))
if [ $diff -ge 4000 ]
then
        sed "/$bike/{s/$old_mileage$/$new_mileage/g}" input_file
fi

Use -i option with sed to make the changes inline i.e. directly

--ahamed
 

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CURRENT(3)								 1								CURRENT(3)

current - Return the current element in an array

SYNOPSIS
mixed current (array &$array) DESCRIPTION
Every array has an internal pointer to its "current" element, which is initialized to the first element inserted into the array. PARAMETERS
o $array - The array. RETURN VALUES
The current(3) function simply returns the value of the array element that's currently being pointed to by the internal pointer. It does not move the pointer in any way. If the internal pointer points beyond the end of the elements list or the array is empty, current(3) returns FALSE. Warning This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function. EXAMPLES
Example #1 Example use of current(3) and friends <?php $transport = array('foot', 'bike', 'car', 'plane'); $mode = current($transport); // $mode = 'foot'; $mode = next($transport); // $mode = 'bike'; $mode = current($transport); // $mode = 'bike'; $mode = prev($transport); // $mode = 'foot'; $mode = end($transport); // $mode = 'plane'; $mode = current($transport); // $mode = 'plane'; $arr = array(); var_dump(current($arr)); // bool(false) $arr = array(array()); var_dump(current($arr)); // array(0) { } ?> NOTES
Note You won't be able to distinguish the end of an array from a boolean FALSE element. To properly traverse an array which may contain FALSE elements, see the each(3) function. SEE ALSO
end(3), key(3), each(3), prev(3), reset(3), next(3). PHP Documentation Group CURRENT(3)
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